End creasing mechanism for bags



Jan, 31, 1939.

H. A BAUER END GREASING MECHANISM FOR BAGS Filed Deb. 24, 1936 4 Sheets-Sheet 1 1939. H, A. BAUER 2,1453% END CREASING MECHANISM FOR BAGS Filed Dec. 24, 1936 4 Sheets-Sheet 2 Jan. 31, 1939. H. A. BAUER END CREASING MECHANISM FOR BAGS Filed Dec. 24, 1936 4 Sheets-Sheet 3 JML 31, 1939. H Av BAUER 1 2,145,386

END CREASING MECHANISM FOR BAGS Filed Dec. 24, 1956 4 Sheets-Sheet 4 L 5W m 5 Patented Jan. 31, 1939 UNITED END CREASING MECHANISM FOR BAGS Hans A. Bauer, Chicago, Ill., assignor to B. F.

Gump 00., Chicago, 111., a corporation of K1- linois Application December 24, 1936, Serial No. 117,557

This invention relates to an end creasing mechanism for bags.

In bag closing machines, it is necessary to provide end creasing devices that crease and. fold inwardly the ends of the neck of the bag so that the side portions of such neck can be brought together or collapsed and later folded. At the present time some bags are made with .a Cellophane cover or of such material or thickness that it is impossible to crease and fold inwardly the ends of the neck portions of the bag by the devices now in use.

It is, therefore, an object of this invention to provide a creasing and folding mechanism for creasing the end portions of the necks of bags of the class mentioned above. invention consists of a pair of cooperating members for each end of the bag that are manipulated for simultaneously engaging and molding the end portions of the neck of a bag to provide the proper creases for a later folding operation.

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings, which illustrate a preferred form of this invention and in which similar reference numerals refer to similar features in the different views:

Figure 1 is a top plan view of the mechanism involving this invention.

Figure 2 is a side elevational view taken substantially upon the line IIII of Fig. 1.

Figures 3 and 4 are fragmentary front elevational views with parts in section showing the operation of certain parts during the process of creasing a bag partly shown in section.

Figure 5 is an enlarged sectional view taken upon the line V--V of Fig. 1.

Figure 6 is a part sectional and part elevational view taken upon the line VIVI of Fig. 1, with parts omitted.

Figure 7 is an elevational view of a male die constituting one member of the creasing mechanism.

Figure 8 is an elevational View of the female die that cooperates with the male die.

Figure 9 is a part elevation and part sectional view of a pair of cooperating dies with .a portion of a bag shown in section therebetween to illustrate the performance thereof.

Figure 10 is a top plan view of a bag with the neck portion folded in and creased according to this invention.

It will be understood that the illustrated mech- Claims.

To this end, the

anism is one unit of a bag closing machine which has a platform i (Fig. 2) for supporting the operating parts of the machine. Upon this platform, there is a bearing standard 2 to the upper end of which the rear end of a lever 3 is pivoted. 5 in any suitable manner.

vWith reference to Fig. 2, it will be observed that the rear portion of the lever 3 is of arcuate form and carries a roller 5 for cooperating with a cam 5 secured upon an operating shaft 6. The forward end of the lever 3 is pivotally connected to a cross head i by means of a pin 8.

The cross head i is slidably mounted upon a pair of guide posts 9 supported upon the platform i. Upon each side of the cross head i there is pivoted an arm it as indicated at M. It will be noted that the arms iii are pivoted intermediate their ends and that their rear portions extend into cooperative relation with the cam 5 Where they are provided with rollers H2. The cam 5 is provided with suitable side lugs or cam portions it and 13a for engaging said rollers for a purpose that will later appear. The center of medial portion of the cross head l supports a central head It which has laterally projecting arms 55 that support lateral heads It as clearly shown in Figs. 1, 3 and 4.

A pair of dies it and 88 are supported between each lateral head It and the central head It. The dies ll which constitute the male dies are provided with laterally extending pins or studs Iii and 20 that slidably extend thru the lateral heads it for slidably supporting the same. The female dies iii are provided with laterally extending arms 2! which are pivoted to a bolt 22 extending thru a suitable bifurcation in the lower end of the head i i. Thus the female dies are susceptible of tilting by gravity upon their pivot bolt 22 as shown in Fig. l for the purpose of entering the mouth of a bag. A spring 23 sur- 40 rounds each bolt it between an abutment 24 at the outer ends thereof and the adjacent head I6 for normally urging the dies ll against the heads It.

To the top of each die it there is secured a bearing block 25 thru which a hollow plunger 26 slidably extends. A coil spring 2? (Fig. 5) is positioned within the hollow plunger and a threaded plug 28 fits in the hollow plunger for adjusting the spring. This plug 28 has a threaded relation with an L-shaped bracket 29 secured to the blocks 25.

The die I8 is formed with a right angle at its upper end as clearly shown in Fig. 5. This angle forms a recess with .an upstanding portion or abutment 30 adapted for engagement by the plunger 26 during a creasing operation for righting the die H! as will later more fully appear.

Movement of the dies i'i into operative relation with the dies 58 is effected by means of the arms l0. To this end, the forward ends of the arms Ill are provided with studs 3| that .are di rected toward the dies ll. The inner ends of the studs 3i are preferably enlarged as indicated at 32 and they are adapted for engaging pads 33 which may form a part of the dies 51. The heads l6 are cut away as indicated at 34 (Fig. 2) to allow the studs 3! and arms Hi to swing toward each other to bring the dies into cooperative relation.

It is of course necessary for the heads l4 and Hi to fall and rise in a true vertical direction and for this reason a further guiding means is provided for the cross head "i. This guiding means which is best shown in Fig. 2, consists of a guide roll 35 supported upon a bracket 36 extending from the platform I and a vertical guide strip 31 attached to the cross head and engaging the roller 35.

The confronting faces of each pair of dies or creasing members i! and I8 may be made of suitable conformation to crease the ends of the neck of the bag as desired. The preferable conformation of the confronting faces of the dies has been illustrated. It will be noted in Figs. '7 to 9 that the male die I? has its confronting face beveled from a center line Ha forming a forwardly projecting angular portion lib having converging surfaces, while the female die is provided with a depression lSd having inwardly converging surfaces to receive the angular portion of the die l! as shown in dotted lines in Fig. 1. Thus the two dies have oppositely converging surfaces which form a V-fold in each end of the neck of the bag when the same are brought together.

The lower portion of the female die I8 is formed with three connected grooves 38, 39 and 45 that form a triangle as shown in Fig, 8, with the apex thereof in the center line of the die. It will be noted in Fig. 9 that this triangular portion slopes downwardly and toward the male die and is in angular relation to the plane of the die.

The male die has a lower triangular portion tie that is bounded by ribs 4|, 42 and 43 that form a triangle for entering the triangular groove formed by the grooves 38, 39 and 40 in the female die. The triangular portion lie of the male die slopes rearwardly from the front face at the same angle as the sloping triangular portion of the female die.

In operation, as the dies come together, they will fold inwardly the ends of the neck of the bag and the triangular portions will bend inwardly and crease the lower portion of the neck of the bag.

In Fig. 10, there is shown a paper bag 44 with the ends of the neck folded inwardly upon converging lines 45 and in Fig. 9 there is shown the upper portion of the bag with the inwardly sloping creased portion 44a that is formed by the triangular creasing portions of the dies.

During operation of the machine in which this mechanism herein constitutes a unit, the paper bags will pause in proper position beneath the head M. While a bag is moving into position, the roller 4 will naturally be riding upon the high portion 4a of the cam and the lever 3 and heads I4 and IE will be in elevated position as shown in dotted lines in Fig. 2. However,

when the bag has come to rest below the head it, the roller 4 will ride off the high portion of the cam 5 which rotates in counterclockwise direction as indicated by the arrow in Fig. 2 and upon the lower portion 41), and allow the lever 3 and heads l4 and IE to descend with the female dies in converging position for entering the mouth of the bag as shown in Fig. 4. At about this time, the wing cam portions l3 and l3a will be brought into operative relation with the rollers II and begin the swinging movements of the front ends of the arms it! toward each other. This movement of the arms ID will move the male dies ll toward the female dies and cause the plungers 26 to engage the shoulders 30 on the female dies for righting the same, that is swinging the same to vertical positions. While this righting movement of the female dies is taking place, the roller 4 will be riding upon the portion 40 of the cam 5.

As soon as the roller 4 rides off the cam portion 40 and descends upon the cam portion 4d, the lever 3, heads 14 and i6 together with the arms it will again descend to bring the parts into proper positions for creasing the ends of the neck of the bag which occurs while the roller 4 is traveling upon the long dwell 4d of the cam. This creasing movement is accomplished when the wing cam portions l3 and l3a swing the forward ends of the arms or levers I6 toward each other sufficiently to bring each pair of male and female dies tightly together to properly crease the end portions of the neck of the bag which are confined between such dies.

As soon as the creasing operation has been completed, the wing portions l3 and l3a of the cam will move away from the lever arms in and allow the springs 23 to retract the male dies, allowing the parts to be elevated by the cam 5 which will have rotated to bring the high portion into engagement with the roller 4.

From the foregoing, it will be evident that a novel creasing mechansm has been provided for creasing the ends of the neck of bags when Cellophane covers are used or when the bags are made of thin or thick material and thus facilitating the later folding of the neck portions and sealing the same. It will further be appreciated that the dies or creasing members have a molding effect that prevents the creased portions from springing back to their original positions.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

I claim as my invention:

1. In an apparatus of the class described, a movable structure, a pair of bag creasing members pivotally supported by said movable structure and adapted for swinging into substantially converging relation for entering the mouth of a bag, a pair of cooperating creasing members slidably supported by said movable structure, and means for moving said last mentioned members for bringing the same into creasing relation with the first mentioned creasing members.

2. In an apparatus of the class described, a movable structure having a central head and lateral heads spaced from said central head, a pair of dies pivoted to said central head, one upon each side thereof and adapted for swinging into converging relation for entering the mouth of a bag, a die slidably mounted adjacent the inner side of each lateral head, and means for actuating said last mentioned dies for bringing the same respectively into operative relation with the first mentioned dies.

3. In an apparatus of the class described, a pair of vertical guide posts, a cross head slidably mounted upon said posts, die supporting means carried by said cross head, movable dies carried by said means, levers pivoted to said cross head and engaging the outermost dies on said means, a cam having a cam surface for actuating said levers and also having a second cam surface, and a lever connected at one end to said cross head and having means for engaging said second cam surface whereby said cross head may be raised and lowered.

4. In an apparatus of the class described, a supporting platform, a standard on said platform, rotary cam means mounted upon said platform and including a plurality of cam surfaces, a lever pivoted to said standard and having a roller in engagement with one of said cam surfaces, a die supporting structure carried bythe forward end of said lever, cooperating dies movably mounted upon said structure and levers pivoted to said sup-porting structure and in engagement with another of said cam surfaces for moving said dies into operative relation.

5. In an apparatus of the class described, a base member, a pair of vertical guide posts rising from said base member, a cross head slidably mounted upon said posts, a pair of dies pivotally mounted upon said cross head for normally swinging into converging relation, for entering the mouth of a bag, a pair of dies slidably mounted upon said cross head, levers pivoted intermediate their ends upon said cross head for actuating said slidable dies, means for raising and lowering said cross head and means for actuating said levers.

6. In an apparatus of the class described, a platform, vertical guide posts rising from said platform, a cross head slidably mounted upon said posts, spaced pendant abutments carried by said cross head, said abutments comprising a cen tral abutment and end abutments, a die pivoted upon each side of said central abutment and adapted for normally swinging into converging relation for entering the mouth of a bag, a die having rods slidably mounted in each end abutment, levers pivoted upon said cross head for actuating said slidable dies, means for actuating said cross head and means for actuating said levers.

'7. In an apparatus of the class described, a vertically movable cross head, a pair of dies pivoted to said cross head for swinging by gravity into converging relation for entering the mouth of a bag, a pair of dies slidably mounted upon said cross head, one upon each side of said pair of dies, levers pivoted intermediate their ends to said cross head and having means at their outer ends for engaging said slidable dies and means for simultaneously actuating said levers for causing said slidable dies to engage said pair of dies and swing the same into parallelism for cooperating therewith for creasing the end walls of a bag.

8. In a bag creasing mechanism, a vertically movable cross head, means for supporting and actuating the same, a pair of dies pivoted to said cross head for normally swinging by gravity into converging relation for entering the mouth of a bag, a pair of slidably mounted dies upon said cross head, one upon each side of said first pair of dies, and means for actuating said slidable dies for causing each one to engage one of said first mentioned dies for first righting the same and then cooperating therewith for creasing the ends of said bag.

9. In a bag creasing mechanism, a vertically movable member, means for supporting and actuating said member, a creasing die pivoted to said member and swingable by gravity to an inclined position for entering the mouth of a bag, a cooperating die slidably mounted uponv said member and means for actuating said slidable die for engaging said pivoted die for first righting the same and then cooperating therewith for creasing the wall of said bag.

10. In an apparatus for creasing bags, a movable cross head, means for supporting and guiding the same for movement, a die connected to said member and swingable by gravity to an inclined position for entering the mouth of a bag, a die slidably connected to said cross head and having means at one end for engaging said swingable die for righting the same, and means for actuating said slidable die for moving the same toward said swingable die for first righting the same and then cooperating therewith for creasing the wall of the bag.

11. In an apparatus for creasing bags, a movable cross head, a plurality of creasing dies associated with said cross head and movable into converging relation for entering the mouth of a bag, a plurality of slidably mounted dies connected to said cross head, one upon each side of said creasing dies, means for contemporaneously actuating said slidable dies for bringing the same into engagement with said creasing dies for creasing the wall of the bag, and means for moving said slidable dies out of engagement with said creasing dies.

HANS A. BAUER. 

